Rcal, resistor calibration, and RCcal, resistor capacitor calibration, are commonly used in RFIC design. However, if you google it, not much information pops up. This article touches what they are about, how to do calibration, and other considerations.
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For JLarson’s point, external cal can be done on tester but this on chip cal can deal with aging and temperature change
Some comparison of this on-chip cal vs external high precision R based cal would be nice. Nice!